#ifndef __M_FMT_H__
#define __M_FMT_H__

#include <ctime>
#include <vector>
#include <cassert>
#include <sstream>
#include "util.hpp"
#include "level.hpp"
#include "message.hpp"
namespace bitlog
{
    // 抽象格式化子项基类
    class FormatItem
    {
    public:
        using ptr = std::shared_ptr<FormatItem>;
        virtual void format(std::ostream &out, const LogMsg &msg) = 0;
    };
    // 派生格式化子项子类 消息 等级 时间 文件名 行号 线程id 日志器名 制表符 换行 其它
    class MsgFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << msg._payload;
        }
    };
    class LevelFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << LogLevel::toString(msg._level);
        }
    };
    class TimeFormatItem : public FormatItem
    {
    public:
        TimeFormatItem(const std::string &fmt = "%H:%M:%S") : _time_fmt(fmt) {}
        void format(std::ostream &out, const LogMsg &msg) override
        {
            struct tm t;
            localtime_r(&msg._ctime, &t);
            char tmp[32] = {0};
            strftime(tmp, 31, _time_fmt.c_str(), &t);
            out << tmp;
        }

    private:
        std::string _time_fmt; //%H:%M:%S
    };
    class FileFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << msg._file;
        }
    };
    class LineFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << msg._line;
        }
    };
    class ThreadFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << msg._tid;
        }
    };
    class LoggerFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << msg._logger;
        }
    };
    class TabFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << "\t";
        }
    };
    class NLineFormatItem : public FormatItem
    {
    public:
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << "\n";
        }
    };
    class OtherFormatItem : public FormatItem
    {
    public:
        OtherFormatItem(const std::string &str) : _str(str) {}
        void format(std::ostream &out, const LogMsg &msg) override
        {
            out << _str;
        }

    private:
        std::string _str;
    };

    class Formatter
    {
    public:
        using ptr = std::shared_ptr<Formatter>;
        Formatter(const std::string &pattern =
                      "[%d{%H:%M:%S}][%t][%p][%c][%f:%l]%m%n") : _pattern(pattern)
        {
            assert(parsePattern());
        }
        // 对msg格式化
        void format(std::ostream &out, const LogMsg &msg)
        {
            for (auto &item : _items)
            {
                item->format(out, msg);
            }
        }
        std::string format(const LogMsg &msg)
        {
            std::stringstream ss;
            format(ss, msg);
            return ss.str();
        }

    private:
        // 对格式化规则字符串进行解析
        bool parsePattern()
        {
            // 对格式化规则字符串进行解析 [%d{%H:%M:%S}][%t][%c][%f:%l][%p]%T%m%n
            std::vector<std::pair<std::string, std::string>> fmt_order;
            size_t pos = 0;
            std::string key, val;
            while (pos < _pattern.size())
            {
                // 处理原始字符串--判断是否是% 不是就是原始字符串

                if (_pattern[pos] != '%')
                {
                    val.push_back(_pattern[pos++]);
                    continue;
                }
                // 代表不是 ' % '
                // %%
                if (pos + 1 < _pattern.size() && _pattern[pos + 1] == '%')
                {
                    val.push_back('%');
                    pos += 2;
                    continue;
                }
                if (val.empty() == false)
                {
                    fmt_order.push_back(std::make_pair("", val));
                    val.clear();
                }
                // 得到一个格式化字符 %d %t
                pos += 1;
                if (pos == _pattern.size())
                {
                    std::cout << "%之后 没有对应的格式化字符\n"
                              << std::endl;
                    return false;
                }
                key = _pattern[pos];
                // pos指向格式化字符后的位置
                pos += 1;
                if (pos < _pattern.size() && _pattern[pos] == '{')
                {
                    pos += 1;
                    while (pos < _pattern.size() && _pattern[pos] != '}')
                    {
                        val.push_back(_pattern[pos++]);
                    }
                    if (pos == _pattern.size())
                    {
                        std::cout << "子规则{}匹配出错误 ！！！ \n"
                                  << std::endl;
                        return false; // 出错误了 没有找到 '}'
                    }
                    pos += 1; // 指向的是'}'
                }
                fmt_order.push_back(std::make_pair(key, val));
                key.clear();
                val.clear();
            }
            // 根据解析得到的数据初始化格式化子项数组成员
            for (auto &it : fmt_order)
            {
                _items.push_back(createItem(it.first, it.second));
            }
            return true;
        }

    private:
        // 根据不同的格式化字符创建不同的格式化子项
        FormatItem::ptr createItem(const std::string &key, const std::string &val)
        {
            if (key == "d")
                return std::make_shared<TimeFormatItem>(val);
            if (key == "t")
                return std::make_shared<ThreadFormatItem>();
            if (key == "c")
                return std::make_shared<LoggerFormatItem>();
            if (key == "f")
                return std::make_shared<FileFormatItem>();
            if (key == "l")
                return std::make_shared<LineFormatItem>();
            if (key == "p")
                return std::make_shared<LevelFormatItem>();
            if (key == "T")
                return std::make_shared<TabFormatItem>();
            if (key == "m")
                return std::make_shared<MsgFormatItem>();
            if (key == "n")
                return std::make_shared<NLineFormatItem>();
            if (key == "")
            {                
                return std::make_shared<OtherFormatItem>(val);
            }
            std::cout << "没有对应的格式化字符：%" << key << std::endl; 
            abort();
            return FormatItem::ptr();
        }

    private:
        std::string _pattern; // 格式化规则字符串
        std::vector<FormatItem::ptr> _items;
    };
}

#endif